Signments



(No Model.)

J. MOARTHUR.

' SASH BALANCE. No. 418,811. I Patented Jan. 7, 1890.

II In Limit H 31H mu t n: l-("g' Ii TM HHI II %'tnessesf N. Pcrzns. Photo-lithograph", Wishingtnn. 1m;

; UNITED STATES JAMES MCARTHUR, OF ROCHESTER, NEW YORK, ASSIGNOR, BY MESNE AS- PATENT OFFICE.

SIGNMENTS, TO JOHN W. MARTIN, ALLEN R. SHEFFER, RINALDO S. KEN- YON, TRUSTEE, AND ADOLPH SORGE, JR., ALL OF SAME PLACE.

-SASH-BALANCE.

SPECIFICATION forming part of Letters Patent No. 418,811, dated January '7, 1890.

Application filed May 21, 1889.

To all whom it may concern.-

Be it known that 1, JAMES MOARTHUR, of Rochester, in the county of l\Ionroeand State of New York, have invented a new and useful Improvement in Sash-Balances, of which the following is a specification, with the accompanying drawings, and the novel features set forth in the claims annexed to the specification.

My invention relates to that class of sashbalances in which the sash is suspended from a rope or cable and in which the tension of a spring replaces the weights commonly used; and my improvements consist, mainly,in using an auxiliary guide-pulley, over which the rope or cable passes in placing the brake, so as to act upon the auxiliary pulley, and in providing a guard for protecting the rope or cable passing over said pulley.

In, the drawings, Figure 1 is a side elevation', and Fig. 2 a rear View, of one form of my device. Figs. 3 and tare respectively a side elevation and front view of another form of my device. Figs. 5 and 6 are respectively a side elevation and an end view of the guidepulley and frame used in Figs. 1 and 2. Figs. 7 and 8 are respectively aside elevation and top view of the guide-pulley and frame used in Figs. 3 and 4. Fig. 9 is a sectional view of the drum and spring used in my device.

A is the face-plate of my sash-balance, to which all the other parts are attached, and which is let into the window-frame so that its outer surface is flush with the face of the frame, and then secured in position by screws or nails through the holes provided in the vices.

face-plate for that purpose. Projecting up from the back i of the face-plate are the two side pieces B B, provided with the notches a.

Into these notches fit the ends I) of the shaft,

upon which the drum 0 revolves freely. This drum contains a spiral spring 0 c, of ordinary construction, which is held securely on the shaft at one end and onthe inside of the drum at the other by any of the usual de- There are two flanges projecting from the sides of the drum, and its surface may be left smooth or may have a continuous groove formed in it, in which the cable or Serial No. 311,566. (No model.)

rope can run. One end of the cable D is securely attached near one of the flanges to the surface of the drum and then winds around the drum, passing thence over the swinging guide-pulley E, and having its other end attached to the sash by any of the ordinary means. The pulley E projects beyond the surface of the plate A through a suitable slot provided in said plate and to sucha dis tance as to allow the cable D to clear the surface of plate A. This pulley is placed on a shaft which is mounted in the frame F, and this frame is-so held as to be able to swing, in order to accommodate the cable which unwinds from the drum at continuously-varying angles, while keeping its direction and 5 location substantially constant after leaving the pulley E. This swinging of the frame F, and thereby of the pulley E, may be accomplished in a .number of different manners;

but I have only illustrated the two construc- 7o tions which I prefer.

In Figs. 1, 2, 5, and 0, F is the frame carrying the pulley E. At its upper end it has a projecting lug A guard G, so shaped as to cover the portion of the cable D on the guide-pulley, is securely attached to the back of the face-plate A, and has a pin d passing through it and the upper lug of the frame F. At its lower end the frame F has another lug projecting from it, which is held to a come sponding lug on the back of plate A by a pin d. These two. pins old are located in line with each other and close to the back of face-plate A, thus enabling the frame Fto swing around them in a plane at right angles to the surface of plate A.

In Figs. 3, 4, 7, and 8 the frame F has the guard G attached to it and projecting beyond the pulley E at one end, while a lug is formed at the same end parallel with the face of the plate A, to which it is heldby the pin 6, passing through the plate and the lug. In this the pulley E. This brake maybe applied in various manners; but I have only illustrated the one I prefer, in which the pressure is applied to the surface of the pulley E by the brake II. I11 this preferred construction the brake-shoe is carried on a strap of metal, which is bent near its lower end so as to pass through a slot provided in the end of frame F, and which has the portion f projecting beyond this slot. The head of the screw 9 bears against this portion f, and is screwed into a projection from the frame F, the end of the threaded part being slotted. By screwing this screw farther in, the head presses the portion f of the brake-strap outward, thereby crowding the shoe harder against the pulley, the fulcrum being in the end of the frame F. By placing the head of the screw between the portion f of the brake-strap and the projection from the frame F the adjusting-screw is securely retained in place and cannot be lost out accidentally. A slot is provided in the frame A opposite the end of screw g, so as to enable an adjustment. of the brake-pressure without disturbing the position of the device.

Other modifications in the construction of this device may be employed, such as altering the position of the brake to the upper end of frame F and allowing the cable to pass under pulley E instead of over it; but I have not illustrated these modifications, as they involve no new features, and I prefer the constructions shown.

I claim 1. In a sash-balance, the combination of a face-plate A with the spring-drum C, holding the cable D, and a swinging guide-pulley E, over which the cable passes, substantially as described.

2. In a sash-balance, the combination of a face-plateA with spring-drum O, holding the cable D, a swinging guide-pulley E, over which the cable passes, and a brake II, operating on the guide-pulley, substantially as described.

In a sash-balance, the combination of a face-plateA with spring-drum C, holding the cable D, a swinging guide-pulley E, over which the cable passes, a brake l'I, operating on the guide-pulley E, and a guard G to protect the cable, substantially as described.

4. In a sash-balance, the combination of a face-plate A with spring-drum O, holding the cable D, a swinging guide-pulley E, over which the cable passes, and an adjustable brake II, operating on the guide-pulley, with an adjusting-screw g, bearing on the prolongation f of the brake-strap, substantially as described.

5. In a sash-balance, the combination of a face-plate A, the spring-drum O, holding the cable D, and guide-pulley E, over which the cable passes, together with a frame holding said guide-pulley and swinging in a plane at right angles to the face-plate, substantially as I 7. In a sasl1balance, the combination of a face-plate A and a grooved spring-drum C, to which the cable I) is attached, and having said cable run in the grooves of said drum, with a guide-pulley E ,over which said cable passes, and a brake operating upon said guidepulley,substantially as described.

JAMES McAR'llIUR. Witnesses:

A. SORGE, Jr., CLINTON PATCHIN. 

